Telephonic recording and reproducing apparatus.



H. C. EGERTON. TELEPHONIC RECORDING AND REPRODUCING APPARATUS.

APPLICATION FILED FEB-1, I918.

Patented Nov. 12, 1918,.

UNITED STATES PATENT: OFFICE.

HENRY C. EGERTON, OF PASSAIC, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONIC RECORDING AND REPRODUCING APPARATUS.

Specification of Letters Patent. Patented Nov, 12, 1918,

Application filed February 1, 1918. Serial No. 214,906.

record of matter telephonically transmitted and to telephonically reproduce matter previously recorded. V

The principal object of the present invention is to provide electrical recording and reproducing apparatus which will accommodate itself to the irregularities and eccentricity of the record so that these will not interfere with uniform and efficient recording upon and reproduction from such a record, and in which the effective mass of the recording or reproducing element resting upon the surface of the record is reduced to a minimum. In accordance withthis feature of the invention an electrical recorderor reproducer suitably supported from the traveling carriage of a phonograph to float freely upon the surface of the phonograph record is provided with an armature which,

-while carrying the recording or reproducing stylus, is mounted for rocking movement relative to the magnet.

Referring to the drawing which illustrates an embodiment of the invention applied to telephonic recording and reproducing devices, Figure 1 is a side elevation of a recorder; Fig. 2 is an enlarged vertical crosssection of Fig. 1; Fig. 3, a plan of Fig. 1 with the cover partially broken away; Fig. 4, a perspective on an enlarged scale of the working parts of the recorder shown in Fig. 1; Fig. 5 is an enlarged perspective of an armature carrying a recording stylus; and Fig. 6 is a similar View of an armature carrying a reproducing stylus.

Phonographs now in general use are provided with traveling carriages which move the recording or reproducing mechanism along the phonographic record. These carriages usually comprise a supporting member having two openings, in one of which the recording sound box is mounted and in the other of which the reproducing sound box is mounted- This member is generally pivoted to the traveling mechanism in such a way that it can be readily turned to bring either the recording or reproducing sound box into record engaging position.

The accompanying drawings illustrate an embodiment of the present invention as applied to telephonic recorders and. reproducers designed to be carried by the supporting'member of the traveling carriageof the phonograph in place of the usual recording and reproducing sound boxes. The telephonic recorder and reproducer of the present invention can thus be readily interchanged for the usual recording and reproducing sound'boxes and operated with the phonographic apparatus without further change in such apparatus.

The telephonic recorder, as shown, comprises a tubular housing 13 designed to fit in the opening 11 of the supporting member 10 of the phonographic apparatus. The housing 13 carries'a bracket l t, to the outer end of which a support 15 carrying the working parts of the reproducer is hinged, so as to be freely movable in a direction perpendicular to the direction of cut of the record. The housing 13 has inturned portions 16 and 17 at the top thereof, which are tapped to receive screws 18 and 19. These screws secure a plate 20, preferably of insulation, to the housing 13. The plate 20 carries four binding posts 21 through which the external conductors 22 and 23 are connected to the light flexible conductors 24 and 25 extending to energizing coils 26, andgled extensions 33 at its upperv end which ex tend towardeach other and engage opposite sides of the magnet core 30. An insulating strip 34 carrying a pair of binding clips 35 secured thereto is arranged on the outer side of each of the extensions 33, and a rivet 36 or other suitable fastening device, preferably of non-magnetic material, extends through the strips 3 1, extensions 33 and core 30 to secure these parts in place and rigidly support the magnetic structure relative to the support 15. The energizing coils c are preferably connected in series and have the same direction of wind, the inner end or one and the outer end of the other of these 3' s being connected to two or; respective which in one the tier e conductors The actua n: coils other clips in .milar :lirection of wind of rne two posite to each other to vary iield in accordance with the rre-nts passing through these magnetic mate ial is t its ends to a resilient preferably of phosphor l having a pair of eggs 39 integral .L and bent upward to engage the forwad ends or the arms 32. Each of the legs 39 has an elongated slot 0, to receive a screw ell, which engages a tapped opening in the respective arms 32 to secure the armature 37 in place, the slots 40 allowing adjustment of the armature 3'? relative to the poles of the magnet to obtain the proper air-gap relation therebetween.

The foregoing description applies equally well to telephonic reproducers, the only necessary difference so far as construction is concerned being in the stylusused. In the case of a recorder, a recording stylus 42 is provided to. out sound impressions on the record 43. in response to the armature movements under the action of the telephonic currents traversing the actuating coils 27. The end of the armature 37 of the recorder is also preferably bent as shown in Fig. 5 to present the stylus 42 in a position best adapted to cut the sound impressions on the record 43. I 1

In the case of a telephonic reproducer the armature 4A is preferably as. shown in Fig. 6, and carries a reproducing stylus 45 to engage the sound impressions of a record to be telephonically reproduced. In reproducing, the engagement of the stylus 45 with the sound impressions of the record efiects a mechanical movement of the stylus to vibrate the armature 44, the vibrations of the armature serving in turn to vary the magnetic field of the reproducer. The variations in the magnetic field induce corresponding voice currents in the coils 27, which currents will be impressed upon the telephone line to operate any suitable telephonic receiving device (not shown) connected therewith.

The recorders and reproducers are thus formed of a very few number of parts and are of very small mass so that the Working parts can ride freely on the record and conform to any eccentricity of the record with out affecting the making of a record or reproduction thereiromas the case may be. The support ha an opening so there through,'tl1rough wh'ch a limiting screw a; loosely extends; this screw being adjustable in a tapped opening in the bracket is and des d to be held in adjusted position by 1'5 8. The ustment of the screw such that the support 15 can more within the range necessary for readucing, as the case may he, revent the stylus striking against the record arbor or support on removal of the record, as well hold the re- CO1 ling or reproducing stylus out of contact 1 ith the record when the recorder or repro ducer, respectively, is moved out of record engaging position.

A cover -29 is also provided to fit over the upper part of the housing 13 to inclose the binding posts to prevent tampering ther with and also to protect the working parts against the entrance of dust, the cover it) having an opening 56 in the top thereof for the passage of the conductors 22 and :23 therethrough.

ll hat is claimed is:

1. An acoustic device comprising a membe adapted to be secured toa phonograph for movement therewith relative to the phonograph record, a supporting member secured to said first member and movable perpenmember and mounted for rocking movement relative to said magnet, and a stylus carried directly by said armature adapted to engage the record.

2. 'An acoustic device comprising a member adapted to be secured to a phonograph for movement therewith relative to the phonograph record, a supporting member secured to said first member and movable perpendicularly to the direction of cut of the record, an electromagnet mounted on and movable with said supporting member, an armature carried by said supporting memher and mounted for rocking movement relative to said electromagnet, and a stylus carried directly by said armature adapted to engage the record.

3. An acoustic device comprising a member adapted to be secured'to a phonograph for movement therewith relative to the phonograph record, a supporting member hinged to said first member and movable perpendicularly to the direction of cut of the record, an E-shaped electromagnet mounted on and movable with said supportrectly by said armature adapted to engage I the record.

having a pair of arms and hinged at one end to said first mentioned member for movement perpendicularly to the direction of cut of the record, an electromagnet secured between said arms, an armature carried by said supporting member and mounted 1 for rocking movement relative to said elec engage the record.

tromagnet, and a stylus carried by said armature adapted to engage the record.

5. An acoustic device comprising a member adapted to be secured to a phonograph for movement therewith relative to the phonograph record, asupporting member of light mass secured to said first mentioned member for movement perpendicularly to the direction of cut of the record, an electromagnet of li ht mass secured to said supporting mem er for movement therewith, an armature carried by said supporting member and mounted for rocking movement relative to said electromagnet, and a stylus carried by said armature adapted to 6. An acoustic device comprising a member adapted to be secured to a phonograph for movement therewith relative to the phonograph record, a supporting member having a pair of arms and secured to said first mentioned member for movement perpendicularly to the direction of cut of the record an electromagnet secured to said arms for movement therewith, an armature secured to said arms, and capable of rocking movement relative to said electromagnet, and a stylus carried directly by said armature adapted to engage the record.

7. An acoustic device comprising a member adapted to be secured to a phonograph for movement therewith relative to the honograph record, a supfporting member ing a pair of arms an secured to said first mentioned member for-movement perpendicularlyto the direction of cut of the record, an electromagnet secured to said arms for movement therewith, an armature adjustably secured to said arms to vary the air gap between said electromagnetand said armature, said armature being mounted for rocking movement relative to said electromagnet,'and a stylus carried by said armature to engage said record.

8. An acoustic device comprising a member secured to a phonograph for movement therewith relative to the honographrecord, a supporting member hinged to said first mentioned member for movement perpendicnlarly to the direction of cut of the record.

and having a pair of arms, an E-shaped electromagnet secured between said arms, an armature, a reed mounting for said armature secured to said arms and supporting said armature for rocking movement relative to said electromagnet, and astylus mounted on the end of said armature to engage said record.

9. An acoustic device comprising a member adapted to be secured to a phonograph for movement therewith relative to the phonograph record, a supporting member hinged to said first mentioned member for movement perpendicularly to the direction of cut of the record and having a pair of arms, an

.E-shaped magnetic core secured between said arms, an energizing winding to magnetize said core, a translating winding associated with said core, an armature'carried by said supporting member and mounted for roc g movement relative to said E-shaped magnetic core, and a stylus carried directly by said armature adapted to engage sald record.

10. An acoustic device comprising a lions ing member adapted to besecured to a phonographfor movement therewith relative to the phonograph record, a supportlng member secured to said first mentioned member for movement perpendicularly'to the d1- rec'tion of out of the record and having a pair of arms, an electromagnet of light mass secured between said arms, a translating coil associated with said electromagnet, an armature secured to said supporting member and mounted for movement relative to said electromagnet, a stylus carried by said armature to engage said record, bindlng posts carried by said housing, and flexible conductors connecting said translating winding with said binding posts.

In witness whereof, I hereunto subscribe my name this 24th day of January, A. D., 

